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How do we predict the outcomes of crosses based on Mendel's Laws?
This lesson develops the students' abilities to predict the potential results of genetic crosses. They will use their knowledge of vocabulary and the rules set down in the use of Punnet Squares
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Objectives and Vocabulary: #content
BIO.5 The student will investigate and understand common mechanisms of inheritance and protein synthesis. Key concepts include
d) prediction of inheritance of traits based on the Mendelian laws of heredity;
f) genetic variation;
Genetically diverse populations are more likely to survive changing environments. Recombination and mutation provide for genetic diversity. Some new gene combinations have little effect, some can produce organisms that are better suited to their environments, and others can be deleterious.
Use a Punnett square to show all possible combinations of gametes and the likelihood that particular combinations will occur in monohybrid and dihybrid crosses.
Vocabulary
Mendelian laws
Heredity
Genetic Variation
Recombination
Mutation
Genetic Diversity
Deleterious
Punnet Square
Probability
Prediction
Genetic Cross
Monohybrid cross
Dihybrid cross
Genotype
Phenotype
Homozygous
Heterozygous
Allele
Dominant
Recessive
Warm Ups, etc:
Punnett Square Review - students review and practice performing crosses and predicting outcomes
1 Trait, 2 Trait - students practice performing mono- and dihybrid crosses
Test Cross - students perform crosses and discuss why one would use the "pure-bred homozygous recessive" phenotype in performing a test cross.
Alleles and Independent Assortment - formative assessment for determining how alleles segregate and how the Law of Independent Assortment is applied in dihybrid crosses.
Lecture Notes: #content
Notes - Punnett Squares - information about Mendel and his peas and the terms and rules for predicting probability outcomes of monohybrid crosses.
Notes - Dihybrid Crosses - information about test crossing and how the Law of Independent Assortment is applied in predicting crosses involving two traits
Activities, Assignments, Etc.
Ted-ED: Mendel's Peas- https://www.youtube.com/watch?v=Mehz7tCxjSE
Crash Course Biology- Ear Wax- https://www.youtube.com/watch?v=CBezq1fFUEA
Independent Practice (Critical Thinking WS 8-1/Rabbits)
continue to Non-Mendellian lesson
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